Exhaust pipe



June 11, 1940. A. D. BLANCHARD EXHAUST PIPE Filed June 25, 1958 m 7T /AM/t ATTORNEY.

Patented June 1l, 1940 UNITED V STATE/s EXHAUST PIPE Arthur D. Blanchard, Bloomiieid, N. J., assigner to Eclipse Aviation Corporation, East Orange, N. J., a corporation of New Jersey,

YApplicatiiln June l23, 1938, Serial No. 215,488

2 Claims. ((1257-2416) This invention relates to engines and more particularly to engine exhaust pipes.

An object of the invention is to provide an improved water jacketed exhaust pipe.

Another object of the invention is to provide a flexible-fluid jacketed exhaust pipe.

Another object of the invention is to provide a flexible iuid jacketed engine exhaust pipe that may be readily secured to an engine and a fixed Other objects and features of the invention will appear from the following description in connection with which two embodiments of the invention are' shown in the accompanying drawn ing, in which:

Fig. 1 is an elevational viewf' partly in section, showing the improved exhaust pipe installed on a marine engine.

Fig. 2 is an enlarged view, partly in section,

of the exhaust pipe shown in Fig. l.

Fig. 3 is a view showing'a modified form .of the invention.

Referring to the drawing, lthe improved ex haust manifold 2 is shown in Fig. 2 as comprising an inlet fitting 3, an outer corrugated tube 4, an

inner corrugated tube 6, and. an Ioutlet tting 1. The space between tubes l and 6 constitutes a cooling space wherein water may be circulated by any suitable means for cooling the exhaust gases passing through the inner tube 6.

The tting 3 is adapted to be connected to the engine 8 by any suitable means, such as threads 9, and the fitting 'I is adapted to be connected to the side of the boat I I by any suitable means,

l5 such as threads l0, whereby the engine exhaust gases may be delivered to the outside of the boat.

An engine driven pump I2 is connected to tting 3 in a manner to deliver water -to inlet opening I3, and outlet opening I4 is shown as connected to discharge pipe I6 leading to the outside of the The tubes 4 and 6 are corrugated and the corrugations may be either of the parallelor helical type, but if helical tubes are used, it is preferable that the inner and outer tubes be corrugated with helices of opposite direction so that the exhaust pipe as a whole lwill not twist when it is It may be seen ,that the above described ex-4 haust pipe is iiexible and extensible, therefore it will provide a gas and water tight connection between the engine and the outside of the boat even though there be considerable variation in the relative position of the engine and boat.

The modification shown in Fig. 3 differs from the form shown in Fig. 2 by omitting the exterior uid outlet and the substitution of holes 23 whereby the cooling water maypass from the jacket 22 into the inner portion 24 of the iitting and pass to the outside of the boat with the engine Vexhaust gases.

While two forms of my invention have been illustrated and described, it is understood that this showing and description are illustrative only, and that the invention is not regarded as limited to the forms shown and described norotherwise,- except by the following claims.

What is claimed is:

1. In an engine exhaust pipe, the combination of a spirally corrugated tube adapted to direct the engine exhaust gases, a second spirally corrugated tube arranged about the rst tube to form a closed jacket space, one of said tubes having left hand spiral corrugations and the other tube having right hand corrugations, inlet and outlet means for said jacket space, and a rigid tubular extension secured to each end of said tubes for securing the exhaust pipe to an engine and to a iixed member, each of said rigid connections being arranged to support the tubes in spaced relation to each other. v

2. In an engine exhaust pipe, the combination of a tube spirally corrugated in one direction and adapted to direct the engine exhaust gases, a second tube surrounding the first tube to form a closed jacket space and spirall'y corrugated in a direction opposite to that of the rst tube, a litting secured to one end of each tube for introducing fluid to the jacket and arranged to support the tubes in spaced relation, a second fitting having a pair of concentric inner and outer walls, each of which is secured to the other ends of said. tubes to support the same in spaced relation to form a continuation of said jacket space and the exhaust directing tube, and said inner wall havends of said pipe to the engine and a part remote therefrom.

` ARTHUR D. BLANCHARD. 

